Hot, early shifting problem!

Hey guys I'm new to this forum, so thanx on advance! I have an 84 grand national that runs great when cool, but after it gets hot, it starts early shifting, like O.D. by 30-35 mph! And often times when it's doing this, it will not downshift at stops, and stalls out unless you put it in neutral! Pondering maybe the tps?
 

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Hey guys I'm new to this forum, so thanx on advance! I have an 84 grand national that runs great when cool, but after it gets hot, it starts early shifting, like O.D. by 30-35 mph! And often times when it's doing this, it will not downshift at stops, and stalls out unless you put it in neutral! Pondering maybe the tps?
The torque converter lockup solenoid is sticking closed when hot. It's a common problem. Replace the solenoid. It's an easy fix. Just drop the pan. It's held in with two 10mm bolts.
 
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